CN102244362A - Three-level multi-channel principal oscillation-power amplification coherent compound myriawatt-level optical fiber laser - Google Patents
Three-level multi-channel principal oscillation-power amplification coherent compound myriawatt-level optical fiber laser Download PDFInfo
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Abstract
The invention discloses a three-level multi-channel principal oscillation-power amplification coherent compound myriawatt-level optical fiber laser which consists of a seed laser source, a primary amplification module, six secondary amplification modules, 36 tertiary amplification modules and a coherent compound device; the seed laser source is connected with the primary amplification module; the primary amplification module is respectively connected with the six secondary amplification modules; each secondary amplification module is respectively connected with six tertiary amplification modules; the 36 tertiary amplification modules are respectively connected with the coherent compound device; and seed lasers which are emitted by the seed laser source are subjected to multi-level amplification through the primary amplification module, the secondary amplification modules and the tertiary amplification modules sequentially, and are subjected to beam splitting so as to form 36 paths of lasers, and the 36 path of lasers are output after being subjected to coherent compound through the coherent compound device. According to the invention, the restriction of threshold value damage does not exist, and the thermal effect problem in the ultrahigh power laser output is avoided; and myriawatt-level laser output is realized by adopting the same-source seeds through three-level distributed amplification and then coherent compound.
Description
Technical field
The invention belongs to laser technology field, be specifically related to a kind of fiber laser, particularly a kind of three grades of multichannel main oscillations-power amplifications (MOPA) high-power coherent synthesizes myriawatt level fiber laser.
Background technology
Fiber laser is little with its volume, efficient is high, good stability, good beam quality, be easy to advantages such as transmission, develop very rapid, but still there are a lot of bottlenecks to break through at the ultra high power fiber laser at present, all face a difficult problem that causes the device damage because of heating as ultra high power generation of Laser, transmission etc.Adopt the method for beam combination in the superpower laser field more, in all kinds of beam combination methods, mainly contain three classes: 1. incoherent beam combination, power behind the beam combination can be too not high, and beam quality is very poor, as: a kind of laser power synthesizer and adopt superpower laser (201010108106.5), multiplex beam combination optical fiber laser (200710018886.2), the Active Optical Fiber bundle high power laser (200820110100.x) of this synthesizer; 2. half manifold type coherent beam combination, synthetic light beam has certain coherence, but degree of coherence is generally all not really high, the effect of its coherent superposition is had a greatly reduced quality, as: phase locking multi-light beam coherent superimposed optical fiber laser (200510016772.5), optical fiber laser group beam laser (200510023475.3); 3. photonic crystal fiber, institute's power is less at present, and technology is not perfect, as: photon crystal optical fiber laser group beam laser (200620136423.7), polarization-maintaining photonic crystal fiber beam laser (200910059734.6).
The transmission of high power laser light at present, for tens watts of modes to the many usually employing energy optical fibers of hectowatt grade laser transmission, because it is easy to use, advantages such as energy loss is little, be widely used in industries such as industrial processes, but under the ultra high power situation, particularly kilowatt and even the laser transmission of myriawatt level, because of it often exceeds the damage threshold of energy optical fiber, this has limited its application greatly.
Summary of the invention
At defective that exists in the above-mentioned prior art or deficiency, the objective of the invention is to, a kind of three grades of multichannels synthetic fibre-optical laser that is concerned with is provided, this laser adopts homology seed laser and three grades of multichannel power amplification structures, successively through laser amplify, along separate routes, amplify again, more along separate routes, three grades of amplification, relevant synthesizing, realize that the multi-path laser spatial coherence is synthetic, obtain the output of myriawatt level ultra high power laser, solved the transmission problem of ultra high power laser simultaneously.
In order to reach above-mentioned technique effect, the application adopts following technical solution:
The relevant synthetic myriawatt level fiber laser of a kind of three grades of multichannel main oscillations-power amplifications, by the seed laser source, the one-level amplification module, 6 secondary amplification modules, 36 three grades of amplification modules and coherence synthesizing device are formed, described seed laser source connects described one-level amplification module, described one-level amplification module connects described 6 secondary amplification modules respectively, each secondary amplification module connects 6 described three grades of amplification modules respectively, described 36 three grades of amplification modules connect described coherence synthesizing device respectively, the seed laser that is sent by described seed laser source passes through the one-level amplification module successively, the secondary amplification module, three grades of amplification modules, carry out multistage amplification, form 36 road laser after the beam splitting, this 36 road laser is by the relevant synthetic back output of coherence synthesizing device.
The present invention also comprises following other technologies feature:
Described seed laser source is by pumping source, and total reflection optical fiber grating, main oscillations optical fiber, output grating, optical isolator are formed; The input welding mutually of the output of pumping source and total reflection optical fiber grating, total reflection optical fiber grating output and amplifying fiber welding mutually, amplifying fiber and the welding of output grating, output grating and optical isolator welding.
It is the LD pumping source of the fine output of 976nm magnetic tape trailer that described pumping source adopts wavelength, the centre wavelength of total reflection optical fiber grating is the narrow linewidth fiber grating of 1080nm, amplifying fiber is the single-mode double-clad Yb dosed optical fiber, and output grating centre wavelength is 1080nm half reflection narrow linewidth fiber grating.
Described one-level amplification module comprises 6 one-level pumping sources, one-level bundling device, one-level amplifying fiber, one-level optical fibre light splitting device, one-level laser power monitor device and one-level PA pump power controller.The flashlight input welding of optical isolator output and one-level bundling device, 6 pump light input weldings one to one of the output of 6 one-level pumping sources and one-level bundling device, the input welding of the output of one-level bundling device and one-level amplifying fiber, the input welding of the output of one-level amplifying fiber and one-level optical fibre light splitting device, one-level optical fibre light splitting device has 7 tunnel outputs, the 1-6 road output of one-level optical fibre light splitting device links to each other one to one with 6 secondary amplification modules respectively, the 7 tunnel output of one-level optical fibre light splitting device connects one-level power monitoring device, the output of one-level power monitoring device connects one-level PA pump power controller, and the one-level power controller connects the one-level pumping source.
It is the fine LD pumping source of 976nm magnetic tape trailer that described one-level pumping source adopts wavelength, the one-level bundling device adopts (6+1) * 1 bundling device, the one-level amplifying fiber is the double clad Yb dosed optical fiber, and one-level optical fibre light splitting device adopts 1 minute 7 optical fibre light splitting device, and above element constitutes one-level and amplifies and the laser beam splitter function.
The structure of described 6 road secondary amplification modules is identical, the 1-6 road output of one-level optical fibre light splitting device and the flashlight input welding one to one of the secondary bundling device of 6 secondary amplification modules; Each secondary amplification module comprises that 6 diode pumping sources, secondary bundling device secondary amplifying fiber, secondary optical fiber optical splitter, secondary laser power monitor device and secondary power amplify the pumping power controller; In each secondary amplification module, the output in 6 diode pumping sources respectively with 6 pump light input weldings one to one of secondary bundling device, the input welding of the output of secondary bundling device and secondary amplifying fiber, the input welding of secondary amplifying fiber output and secondary optical fiber optical splitter, secondary optical fiber optical splitter has 7 tunnel outputs, the 1-6 road output of secondary optical fiber optical splitter links to each other one to one with 6 three grades of amplification modules respectively, the 7 tunnel output of secondary optical fiber optical splitter connects the secondary power monitoring device, the output of secondary power monitoring device connects the secondary power controller, and the secondary power controller connects the diode pumping source.
Described diode pumping source is that wavelength is a 40W band 100um tail optical fiber LD pumping source for the 976nm power output, the secondary bundling device adopts (6+1) * 1 bundling device, the secondary amplifying fiber is a 20/400um double clad Yb dosed optical fiber, and secondary optical fiber optical splitter adopts 1 minute 7 optical fibre light splitting device.
The structure of described 36 tunnel three grades of amplification modules is identical; The 1-6 road output of each secondary optical fiber optical splitter and the flashlight input welding one to one of three grades of bundling devices of 6 three grades of amplification modules;
Each three grades of amplification module comprises 6 triplex Pu Yuan, three grades of bundling devices, three grades of amplifying fibers, coated fiber and Transmission Fibers; In each three grades of amplification module 4, the output in source, 6 triplex Pus respectively with 6 pump light input weldings one to one of three grades of bundling devices, the input welding of the output of three grades of bundling devices and three grades of amplifying fibers, three grades of amplifying fibers are connected by coated fiber with Transmission Fibers; Transmission Fibers is exported laser.
It is 100W band 200um tail optical fiber LD pumping source for the 976nm power output that wavelength is adopted in source, described triplex Pu, three grades of bundling devices adopt (6+1) * 1 bundling device, three grades of amplifying fibers adopt 35/400um double clad Yb dosed optical fiber, the doubly clad optical fiber that coated fiber adopts high index of refraction to apply.
Described spatial coherence synthesizer is a red copper piece, and 36 circular holes are arranged on this red copper piece, and these 36 circular holes divide 6 layers of arrangement, 6 every layer; The Transmission Fibers of 36 tunnel three grades of amplification modules 4 is inserted respectively in 36 circular holes of spatial coherence synthesizer; Corner dimension is satisfied between the straight line at adjacent circular holes place converges at some output laser of 36 Transmission Fibers under paraxial condition, spacing between the Transmission Fibers and angle are adjusted according to the position of laser convergent point, and described circular hole aperture is greater than the Transmission Fibers external diameter.
Three grades of multichannel main oscillations-power amplifications (MOPA) structure of uniqueness of the present invention, multinomial unique design such as output, shunt transmission technology and the spatial coherence of realization myriawatt level ultra high power laser is synthetic, solved the problems that the aspect faced such as the generation of present ultra high power laser, transmission, application, outstanding technical characterictic of the present invention and advantage are as follows comprehensively:
1) seed source and amplifier section adopt all optical fibre structure, make laser of the present invention have very high reliability, integration; Relevant composite part adopts space structure, makes laser not have the restriction of damage threshold, has avoided ultra high power laser to export the thermal effect problem that is faced; Adopt the homology seed by three grades of distributed amplifications, again through the relevant synthetic myriawatt level laser output that realizes.
2) amplification modules at different levels are provided with laser power monitor device and pump power control device, make whole laser have very high power stability;
3) 6/125um double-cladding active optical fiber and narrow pulsewidth fiber grating are adopted in the laser seed source, make laser have good beam quality---single transverse mode, narrow linewidth;
4) the present invention adopts distributed transmission, has solved the ultra high power transmission problem well;
5) the space laser coherence synthesizing device adopts space structure, design is succinct, handling ease, volume is small and exquisite, easy to use, avoided the restriction of optical fiber damage threshold under high power simultaneously, directly be concerned with 36 tunnel homology coherent lasers synthetic by the paraxial ethod of remittance, break through the restriction that traditional simple optical fiber spreads out of power, can obtain very high laser power output.
Description of drawings
Fig. 1 is a general structure schematic diagram of the present invention;
Fig. 2 is laser seed source and one-level amplification module structural representation;
Fig. 3 is a secondary amplification module structural representation;
Fig. 4 is three grades of amplification modules and transmission structure schematic diagram;
Fig. 5 is the coherence synthesizing device structural representation, wherein, (a) is front schematic view, (b) is side schematic view.
Fig. 6 is an one-level power control feedback loop structural representation;
Fig. 7 is a secondary power feedback control loop structural representation;
Fig. 8 is total pump power of the present invention and laser output power graph of a relation.
Below in conjunction with the drawings and specific embodiments the present invention is further explained.
Embodiment
As shown in Figure 1, the relevant synthetic myriawatt level fiber laser of three grades of multichannel main oscillations-power amplifications of the present invention (MOPA), structure is as follows: this laser is by seed laser source 1, one- level amplification module 2,6 secondary amplification modules 3,36 three grades of amplification modules 4 and coherence synthesizing device 5 are formed, seed laser source 1 connects one-level amplification module 2, one-level amplification module 2 connects 6 secondary amplification modules 3 respectively, each secondary amplification module 3 connects 6 three grades of amplification modules 4 respectively, 36 three grades of amplification modules 4 connect coherence synthesizing device 5 respectively, the seed laser that is sent by seed laser source 1 passes through one-level amplification module 2 successively, secondary amplification module 3, three grades of amplification modules 4 carry out multistage amplification, form 36 road laser after the beam splitting, this 36 road laser is by coherence synthesizing device 5 relevant synthetic back outputs.
The design in seed laser source 1:
As shown in Figure 2, seed laser source 1 is by pumping source 6, and total reflection optical fiber grating 7, amplifying fiber 8, output grating 9, optical isolator 10 are formed; The input welding mutually of the output of pumping source 6 and total reflection optical fiber grating 7, total reflection optical fiber grating 7 outputs and amplifying fiber 8 welding mutually, amplifying fiber 8 and 9 weldings of output grating, output grating 9 and optical isolator 10 weldings.
The effect in seed laser source 1 is that the quality of seed laser has directly determined the laser quality of final output for follow-up each module provides seed laser; (0 effect is protection seed laser source 1 to optical isolator, and the laser of exporting via optical isolator 10 is single transverse mode linear polarization continuous laser, can more effectively realize amplifying and relevant synthesizing.
In the above-mentioned parts, it is 40W band 100um tail optical fiber LD pumping source that pumping source 6 adopts the 976nm power output, the centre wavelength of total reflection grating 7 is 1080nm, amplifying fiber 8 adopts 6/125um single-mode double-clad Yb dosed optical fiber, it is 1080nm that output grating 9 adopts centre wavelength, reflectivity is＜90% output linewidth △ λ narrow linewidth fiber grating, this example adopts △ λ=0.1nm, it is 1080nm that optical isolator 10 adopts operation wavelength, insert loss≤0.5dB, isolation 〉=30dB, selecting for use according to actual needs of above-mentioned parts is not limited thereto.By finish the output of the single transverse mode high-quality of narrow linewidth laser seed with upper-part.
The design of one-level amplification module 2:
As shown in Figure 2, one-level amplification module 2 comprises 6 one-level pumping sources 11, one-level bundling device 12, one-level amplifying fiber 13, one-level optical fibre light splitting device 14, one-level laser power monitor device 15 and one-level PA pump power controller 16; The flashlight input welding of optical isolator 10 outputs and one- level bundling device 12,6 pump light input weldings one to one of the output of 6 one-level pumping sources 11 and one-level bundling device 12, the input welding of the output of one-level bundling device 12 and one-level amplifying fiber 13, the input welding of the output of one-level amplifying fiber 13 and one-level optical fibre light splitting device 14, one-level optical fibre light splitting device 14 has 7 tunnel outputs, the 1-6 road output of one-level optical fibre light splitting device 14 links to each other one to one with 6 secondary amplification modules 3 respectively, the 7 road output of one-level optical fibre light splitting device 14 connects Feedback of Power control circuit as shown in Figure 6, this Feedback of Power control circuit comprises one-level power monitoring device 15, one-level PA pump power controller 16, the 7 road output of one-level optical fibre light splitting device 14 connects one-level power monitoring device 15, the output of one-level power monitoring device 15 connects one-level PA pump power controller 16, and one-level PA pump power controller 16 connects one-level pumping source 11.
One-level pumping source 11, one-level bundling device 12, one-level amplifying fiber 13 are formed one-level amplification module core component, and its effect is the amplification of finishing seed laser, obtain enough big power to realize laser beam splitter; One-level optical fibre light splitting device 14 is used for the laser after amplifying is divided into 7 bundles of power equalization; One-level power monitoring device 15 sends to one-level PA pump power controller 16 to the online detection of this road power output and with testing result, the comparison circuit of one-level PA pump power controller 16 is compared to testing result and default power, and to the control of the pumping current of 6 pumping sources 11, thereby the pump power of control one-level amplification module obtains stable one-level and amplifies output.
Wherein, it is 40W band 100um tail optical fiber LD pumping source that one-level pumping source 11 adopts the 976nm power output, one-level bundling device 12 adopts (6+1) * 1 bundling device, and one-level amplifying fiber 13 is a 20/400um double clad Yb dosed optical fiber, and one-level optical fibre light splitting device 14 adopts 1 minute 7 optical fibre light splitting device.
In the present embodiment, one-level power monitoring device 15 comprises photoelectric detector PD, and one-level PA pump power controller 16 comprises comparison circuit, and this comparison circuit comprises first operational amplifier A
1With second operational amplifier A
2, pumping source 11 is made up of pumping source power supply and semiconductor laser diode LD two parts, and the pumping source power supply mainly comprises negative voltage source-Uc, triode BG.One-level power monitoring device 15 is converted to photoelectric current with the laser power of being gathered, and is sent to first operational amplifier A of one-level PA pump power controller 16
1Amplify A
1Output be sent to second operational amplifier A
2Reverse input end, second operational amplifier A
2Input in the same way receive the direct current reference level by swept resistance R, second operational amplifier A
2Output termination one-level pumping source 11 in the base stage of triode BG, realize control to the LD electric current of flowing through, when the power that amplifies output laser when one-level reduced, the electric current that flows through PD reduced, first operational amplifier A
1The output current potential reduces, i.e. second operational amplifier A
2The reverse input end current potential reduces, so second operational amplifier A
2The output current potential raises, i.e. triode BG input increases, so the supply current I of LD
DIncrease, the LD power output increases, and the power of one-level amplification module output laser increases, thereby reaches stable output.
The design of secondary amplification module 3:
The structure that secondary amplification module 3 has 6 tunnel, 6 road secondary amplification modules 3 is identical; The output of the 1-6 road of one-level optical fibre light splitting device 14 respectively with the flashlight input welding one to one of the secondary bundling device 18 of 6 secondary amplification modules 3;
As shown in Figure 3, each secondary amplification module 3 comprises 6 diode pumping sources 17, secondary bundling device 18, secondary amplifying fiber 19, secondary optical fiber optical splitter 20, secondary laser power monitor device 21 and secondary PA pump power controller 22; In each secondary amplification module, the output in 6 diode pumping sources 17 respectively with 6 pump light input weldings one to one of secondary bundling device 18, the input welding of the output of secondary bundling device 18 and secondary amplifying fiber 19, input 20 weldings of secondary amplifying fiber 19 outputs and secondary optical fiber optical splitter, secondary optical fiber optical splitter 20 has 7 tunnel outputs, the 1-6 road of secondary optical fiber optical splitter 20 links to each other one to one with 6 three grades of amplification modules 4 respectively, the 7 road output of secondary optical fiber optical splitter 20 connects a Feedback of Power control circuit as shown in Figure 7, the composition and the action principle of the Feedback of Power control circuit of this Feedback of Power control circuit and one-level amplification module are identical, comprise secondary power monitoring device 21, secondary power controller 22, the output of secondary power monitoring device 21 connects secondary power controller 22, and secondary power controller 22 connects diode pumping source 17.
Wherein, diode pumping source 17 is a 40W band 100um tail optical fiber LD pumping source for the 976nm power output, secondary bundling device 18 adopts (6+1) * 1 bundling device, and secondary amplifying fiber 19 is a 20/400um double clad Yb dosed optical fiber, and secondary optical fiber optical splitter 20 adopts 1 minute 7 optical fibre light splitting device.Secondary power monitoring device 21 comprises photoelectric detector PD, and secondary power controller 22 comprises comparison circuit, and this comparison circuit comprises first operational amplifier A
1With second operational amplifier A
2, diode pumping source 17 is made up of pumping source power supply and semiconductor laser diode LD two parts, and the pumping source power supply mainly comprises negative voltage source-Uc, triode BG.
The design of three grades of amplification modules 4:
The structure of 36 tunnel three grades of amplification modules 4 is identical; The 1-6 road output of each secondary optical fiber optical splitter 20 and the flashlight input welding one to one of three grades of bundling devices 24 of 6 three grades of amplification modules 3;
As shown in Figure 4, each three grades of amplification module 4 comprises source, 6 triplex Pus 23, three grades of bundling devices 24, three grades of amplifying fibers 25, coated fiber 26 and Transmission Fibers 27; In each three grades of amplification module 4, the output in source, 6 triplex Pus 23 respectively with 6 pump light input weldings one to one of three grades of bundling devices 24, the input welding of the output of three grades of bundling devices 24 and three grades of amplifying fibers 25, three grades of amplifying fibers 25 are connected with Transmission Fibers 27 by coated fiber 26, and Transmission Fibers 27 is exported laser;
Source, triplex Pu 23, three grades of bundling devices 24, three grades of amplifying fibers 25 constitute the core component of three grades of amplification modules, the effect of this core component is that the laser of importing is carried out power amplification, what the structural design of three grades of amplification modules 4 and one-level, secondary amplification module was different is to the no longer beam splitting of laser after amplifying, but reject residual pump light earlier, through transmission, finally make 36 road laser enter coherence synthesizing device 5 and carry out the synthetic and output of spatial coherence again.The effect of coated fiber 26 is to remove residual pump light power in three grades of amplifying fibers 25; Transmission Fibers 27 is used to transmit each road laser.
Wherein, it is 100W band 200um tail optical fiber LD pumping source that the 976nm power output is adopted in source, triplex Pu 23, three grades of bundling devices 24 adopt (6+1) * 1 bundling device, three grades of amplifying fibers 25 adopt 35/400um double clad Yb dosed optical fiber, the doubly clad optical fiber that coated fiber 26 adopts high index of refraction to apply, Transmission Fibers 27 adopts damage threshold 〉=500W energy optical fiber.
The design of spatial coherence synthesizer 5:
As shown in Figure 5, spatial coherence synthesizer 5 is a square platform shape red copper piece, select to be of a size of 10cm*10cm*10cm in the present embodiment, have 36 circular holes, the Transmission Fibers 27 of 36 tunnel three grades of amplification modules 4 to insert respectively in 36 circular holes of spatial coherence synthesizer 5 on this red copper piece.These 36 circular holes divide 6 layers of arrangement, and 6 every layer, circular hole centre distance d=8mm in this embodiment; Angle is α between the straight line at adjacent circular holes place, the size of angle α is determined according to the distance of laser convergent point and coherence synthesizing device 5, the size of α is got less than 30 degree, the more little synthetic effect of angle is good more, get the distance L=50cm of spatial coherence synthesizer 5 in the present embodiment apart from the synthetic point of laser coherence, therefore angle α=d/L ≈ is 0.92 °, angle α size satisfies makes the output laser of 36 Transmission Fibers 27 converge at a bit at distance spatial coherence synthesizer 5 50cm places, to realize 36 tunnel output laser coherence stacks; After as need it being converged at 100cm, can adopt two kinds of methods: 1. be that d changes 16mm into circular hole centre distance; 2. angle between adjacent circular holes is changed into 0.46 ° of α=d/L ≈.The aperture of the circular hole on the red copper piece is slightly thicker than Transmission Fibers 27 external diameters, so that the end of Transmission Fibers 27 is inserted circular hole and fixing.
Input laser is after three grades of amplification modules amplify, every Lu Junke obtains to surpass the laser output power of 300W, the present invention adopts transmission along separate routes to be intended to solve the difficult problem that high power laser light transmits the easy damaged that is faced, because the transmission of 300W-500W laser power is a mature technology, laser of the present invention directly with each road greater than the laser of 300W be transferred to along separate routes be concerned with behind the point of application synthetic, because 36 road laser are all taken from identical laser seed, therefore 36 road laser have good coherence, when they must realize coherent superposition at convergent point, export thereby obtain ultra high power laser.Through experimental test, the present invention exports laser as shown in Figure 8, and when total pump power was 23KW, power output reached 17.5KW, and light-light conversion efficiency is 76%.
The course of work of the present invention:
See through total reflection optical fiber grating 7 by the pump light of pumping source 6 outgoing and inject amplifying fibers 8, amplifying fiber 8 swings optical fiber as principal earthquake; The pump light of output forms seed laser in output grating 9 from amplifying fiber 8, seed laser injects the fibre core that one-level bundling device 12 flashlight inputs are directly sent into one-level amplifying fiber 13 by optical isolator 10, one-level pumping source 11 is sent to the inner cladding of one-level amplifying fiber 13 by the pumping input of one-level bundling device 12, seed laser after one-level amplifying fiber 13 amplifies is divided into the laser of 7 beam power equilibriums by one-level optical fibre light splitting device 14,1-6 road wherein forms secondary seed laser, this 6 road seed laser is identical and subsequent optical path is symmetrical fully, here only describe in this 1-6 road one the tunnel, the flashlight input of road seed laser after the beam splitting by secondary bundling device 18 enters among the fibre core of secondary amplifying fiber 19, the pump light that 6 diode pumping sources 17 are provided is sent to the inner cladding of secondary amplifying fiber 19 by the pumping input of secondary bundling device 18, seed laser after secondary amplifying fiber 19 amplifies is divided into the laser of 7 beam power equilibriums by secondary optical fiber optical splitter 20,1-6 road wherein forms three grades of seed lasers again, form 36 tunnel three grades of seed lasers altogether, the three grades of seed lasers in each road all directly are sent to the fibre core of three grades of amplifying fibers 25 by the flashlight input of three grades of bundling devices 24, the inner cladding of three grades of amplifying fibers 25 is sent in source, triplex Pu 23 by three grades of bundling devices, 24 pumping inputs, remove residual pump light in the optical fiber through the laser that three grades of amplifying fibers 25 amplify through coated fiber 26, by Transmission Fibers 27 laser output is transferred to coherence synthesizing device 5 again, 36 road laser carry out laser coherence by coherence synthesizing device 5 and synthesize; In said process, the power control of each pumping source is controlled by the Feedback of Power control circuit, Feedback of Power control circuit in one-level amplification module and the secondary amplification module is compared to separately this road laser detection and with predetermined power, control pumping source separately with power output.Through check, the present invention has realized the safety output and application of myriawatt level ultra high power.
Claims (10)
1. three grades of multichannel main oscillations-power amplifications are concerned with and synthesize myriawatt level fiber laser, it is characterized in that, described laser is by seed laser source (1), one-level amplification module (2), 6 secondary amplification modules (3), 36 three grades amplification modules (4) and coherence synthesizing device (5) are formed, described seed laser source (1) connects described one-level amplification module (2), described one-level amplification module (2) connects described 6 secondary amplification modules (3) respectively, each secondary amplification module (3) connects 6 described three grades of amplification modules (4) respectively, described 36 three grades amplification modules (4) connect described coherence synthesizing device (5) respectively, the seed laser that is sent by described seed laser source (1) passes through one-level amplification module (2) successively, secondary amplification module (3), three grades of amplification modules (4) carry out multistage amplification, form 36 road laser after the beam splitting, this 36 road laser is by the relevant synthetic back output of coherence synthesizing device (5).
2. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with, it is characterized in that, described seed laser source (1) is by pumping source (6), and total reflection optical fiber grating (7), main oscillations optical fiber (8), output grating (9), optical isolator (10) are formed; The input welding mutually of the output of pumping source (6) and total reflection optical fiber grating (7), total reflection optical fiber grating (7) output and amplifying fiber (8) welding mutually, amplifying fiber (8) and the welding of output grating (9), output grating (9) and optical isolator (10) welding.
3. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with, it is characterized in that, it is the LD pumping source of the fine output of 976nm magnetic tape trailer that described pumping source (6) adopts wavelength, the centre wavelength of total reflection optical fiber grating (7) is the narrow linewidth fiber grating of 1080nm, amplifying fiber (8) is the single-mode double-clad Yb dosed optical fiber, and output grating (9) centre wavelength is 1080nm half reflection narrow linewidth fiber grating.
4. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with, it is characterized in that described one-level amplification module (2) comprises 6 one-level pumping sources (11), one-level bundling device (12), one-level amplifying fiber (13), one-level optical fibre light splitting device (14), one-level laser power monitor device (15) and one-level PA pump power controller (16); The flashlight input welding of optical isolator (10) output and one-level bundling device (12), 6 pump light input weldings one to one of the output of 6 one-level pumping sources (11) and one-level bundling device (12), the input welding of the output of one-level bundling device (12) and one-level amplifying fiber (13), the input welding of the output of one-level amplifying fiber (13) and one-level optical fibre light splitting device (14), one-level optical fibre light splitting device (14) has 7 tunnel outputs, the 1-6 road output of one-level optical fibre light splitting device (14) links to each other one to one with 6 secondary amplification modules (3) respectively, the 7 tunnel output of one-level optical fibre light splitting device (14) connects one-level power monitoring device (15), the output of one-level power monitoring device (15) connects one-level PA pump power controller (16), and one-level power controller (16) connects one-level pumping source (11).
5. three grades of multichannels as claimed in claim 4 synthetic fibre-optical laser that is concerned with, it is characterized in that, it is the fine LD pumping source of 976nm magnetic tape trailer that described one-level pumping source (11) adopts wavelength, one-level bundling device (12) adopts (6+1) * 1 bundling device, one-level amplifying fiber (13) is the double clad Yb dosed optical fiber, one-level optical fibre light splitting device (14) adopts 1 minute 7 optical fibre light splitting device, and above element constitutes one-level and amplifies and the laser beam splitter function.
6. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with, it is characterized in that, the structure of described 6 road secondary amplification modules (3) is identical, the 1-6 road output of one-level optical fibre light splitting device (14) and the flashlight input welding one to one of the secondary bundling device (18) of 6 secondary amplification modules (3); Each secondary amplification module (3) comprises that 6 diode pumping sources (17), secondary bundling device (18), secondary amplifying fiber (19), secondary optical fiber optical splitter (20), secondary laser power monitor device (21) and secondary power amplify pumping power controller (22); In each secondary amplification module, the output in 6 diode pumping sources (17) respectively with 6 pump light input weldings one to one of secondary bundling device (18), the input welding of the output of secondary bundling device (18) and secondary amplifying fiber (19), the input welding of secondary amplifying fiber (19) output and secondary optical fiber optical splitter (20), secondary optical fiber optical splitter (20) has 7 tunnel outputs, the 1-6 road output of secondary optical fiber optical splitter (20) links to each other one to one with 6 three grades amplification modules (4) respectively, the 7 tunnel output of secondary optical fiber optical splitter (20) connects secondary power monitoring device (21), the output of secondary power monitoring device (21) connects secondary power controller (22), and secondary power controller (22) connects diode pumping source (17).
7. three grades of multichannels as claimed in claim 6 synthetic fibre-optical laser that is concerned with, it is characterized in that, described diode pumping source (17) is 40W band 100um tail optical fiber LD pumping source for wavelength for the 976nm power output, secondary bundling device (18) adopts (6+1) * 1 bundling device, secondary amplifying fiber (19) is a 20/400um double clad Yb dosed optical fiber, and secondary optical fiber optical splitter (20) adopts 1 minute 7 optical fibre light splitting device.
8. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with is characterized in that the structure of described 36 tunnel three grades of amplification modules (4) is identical; The 1-6 road output of each secondary optical fiber optical splitter (20) and the flashlight input welding one to one of three grades of bundling devices (24) of 6 three grades amplification modules (3);
Each three grades of amplification module (4) comprises source, 6 triplex Pus (23), three grades of bundling devices (24), three grades of amplifying fibers (25), coated fiber (26) and Transmission Fibers (27); In each three grades of amplification module 4, the output in source, 6 triplex Pus (23) respectively with 6 pump light input weldings one to one of three grades of bundling devices (24), the input welding of the output of three grades of bundling devices (24) and three grades of amplifying fibers (25), three grades of amplifying fibers (25) are connected by coated fiber (26) with Transmission Fibers (27); Transmission Fibers (27) is exported laser.
9. three grades of multichannels as claimed in claim 8 synthetic fibre-optical laser that is concerned with, it is characterized in that, it is 100W band 200um tail optical fiber LD pumping source for the 976nm power output that wavelength is adopted in source, described triplex Pu (23), three grades of bundling devices (24) adopt (6+1) * 1 bundling device, three grades of amplifying fibers (25) adopt 35/400um double clad Yb dosed optical fiber, the doubly clad optical fiber that coated fiber (26) adopts high index of refraction to apply.
10. three grades of multichannels as claimed in claim 1 synthetic fibre-optical laser that is concerned with is characterized in that described spatial coherence synthesizer (5) is a red copper piece, and 36 circular holes are arranged on this red copper piece, and these 36 circular holes divide 6 layers of arrangement, 6 every layer; The Transmission Fibers (27) of 36 tunnel three grades of amplification modules 4 is inserted respectively in 36 circular holes of spatial coherence synthesizer (5); Corner dimension is satisfied between the straight line at adjacent circular holes place converges at some output laser of 36 Transmission Fibers (27) under paraxial condition, spacing between the Transmission Fibers (27) and angle are adjusted according to the position of laser convergent point, and described circular hole aperture is greater than Transmission Fibers (27) external diameter.
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